Thanks! New to international teaching so looking for advice on the big move! Shall email and ask questions!

I will shortly be booking flights as I'm starting in a new school this August. The school reimburses a return flight. Do most people book a return flight (as I'm unsure of the dates I will be returning to mu home country) or can we use it to book two one way flights? Also is it ok to enter a country with a one way flight as I will have a work visa?